Sanding-machine.



R. L. CARTER.

SANDING MACHINE.

APPLICATION FILED MAR. 25. ms.

Patented Sept. 3, 1918.. 2 SHEETS-SHEET I l/VI/E/VTOR Ray L. Carfer R.L. CARTER.

SANDING MACHINE.

APPLICATION FILED MAR. 25. I9I8. 1 27?,377 Patented Sept. 3,1918..

2 SHEETSSHE ET 2.

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' an n. owns, or sense, new roan 1 To all whom it may concern:

Be it known that I, RAY L. CARTER, a citizen of the United States,residing at Syracuse, in the county of Onondaga" and State of New York,have invented certain new and useful Improvements in Sanding- Machines,of which the following is a specification.

This invention relates to improvements in sanding-machines, designedparticularly for use by pattern-makers, wood-workers, and

the like, for grindingand finishing surfaces not accessible to the usualdisk sanders in common use.

The object of the invention is to provide a novel, simple, convenientand compact sanding device of the oscillating spindle type, which iscapable of being operated at high speed bya directdrive and which islight and durable, and wherein a comparatively small number of parts areemployed for the operating mechanism. A further object is to providenovel and simple means for efi'ecting the oscillation of the spindle.

And a flurther object is to generally improve, simplify and .cheapen theconstruction and operation of sanders of the class.

I attain these objects by the means .set forth in the detaileddescription which follows, and as illustrated .by the accompanyingdrawings, in which.

Figure 1 is a side elevation of the com plete machine, with parts brokenaway; showing certain details of construction.

Fig. 2v is a horizontal section, taken on line 2-2 of Fig. 1; showingthe principal parts employed for oscillating the spindle.

Fig. 3 is a broken central vertical section, taken substantially on line33 of Fig. 2;

showing the spindle and the oscillating -mechanism.

Fig. 4 is a transverse vertical section,

takenon line 44 of Fig.2.

. In the drawing, 2 represents the main upright body or hollow column,which is preferalbly mounted on a base 3. 4 represents a forwardlyprojecting detachable hollow body portion secured. to the top front sideof the column 2, by bolts 5. The part 4 has a sennmsaonmn Specificationof Letters Patent. Patented Sept, 3, 1%118;

Application filed March 25, 1918. Serial No. 224,548. r i

. margin of .which comprises an inverted arcs'haped rack 8, the, saidweb also having a corresponding arc-shaped slot 9, by whlch.

the table is. guided when tilted or rotated vertically. 10 represents athreaded stud or bolt carried by the body 4, which passes spindle, whichextends some distance above the top surface ofthe table. The portion ofthe spindle projecting above the table is preferably covered with alayer of heavy sand-paper, or other suitable abradant 18 in the usualmanner. The spindle 13 extends downwardly. throughthe body portion 4,and first passes through-'2. cap 14; which is screwed into the open topof the body 4, and directly beneath the said cap there is a sleeve 15mounted on the spindle 13, the said spindle being movable vertically insaid sleeve, for oscillating the spindle-sander 13, by means of afeather or key 16, which also serves to drive the said sleeve.The'upper' end of the sleeve 15 is rigid in a ring 17 which is a part ofa ballbearing, consisting of rings 17 and 18 and a series of balls 19.The ball-bearing parts preferably rest upon a horizontal ledge 20 of thebody 4, and are held in' place by the cap14, which holds the larger ring18 sta- .bearings 24.-24', which are suitably supported in the body 4,as at 25-25: The main spindle '13 extends downwardly beyond the worm 21and its lower end is in serted and slidable endwise in a sleeve-coupling26, which is journaled by means of a ball-bearing designated generallyby the numeral-28, the latter being disposed in the lower leg of thebody portion 4, between a ledge 29 and a screw-cap 30. The coupling 26drives the spindle 13'by means of a feather or key 26. ,31- representsan electric motor of conventional form, which is mounted on the uprightcolumn 2 and is held in place by a bracket32 and bolts 32. The

armature shaft 31 of the motor is also inand a hand-wheel 38 is employedor. me-

niyiulating said pinion. he spindle 13 which carries the cylindrlcalsander 13 is oscillated vertically, while being rotated by the power ofthe motor, by a rocking lever 39, which is disposed beneath andsubstantially at right angles 'to the worm 21 and the shaft 23. One endof the lever 39 extends into the body 2 and is provided with a yoke 40which straddles flattened portions 41 of a shaft 41, the said shaft beinrockable in bearings 42 in the body 2. ibout midway between its endslever 39 is pivoted by a pin 43 to the lower end of a link or part 44,the upper end'" of said link comprising a loop 44', in which is disposeda ball-bearing consisting of. a ring 45 rigid in said loop, balls 45',and a smaller concentric ring 46 which is rigid on an ec centric cam 23of shaft 23, as best seen in Fig. 3. By this construction andarrangement the link 44 is given a vertically oscillating motion, whichlifts and depresses the lever 39 once every revolution of the shaft 23.The opposite end of the lever 39 comprises a large'yoke 47, whichstraddles the spindle 13 and is pivoted to a circular bearing-holder 48,by pivot screws 48 (see Fig. 2). The holder 48 has a circular cavity orsocket in its top side, in which is disposed a ball-bearing, consistingof a member 50, which is rigid in the holder, balls 50, and a smallerconcentric member 51 which is rigid on the spindle 13 and movabletherewith. The spindle 13 has a shoulder 52 which engages the top of themember'51, and a reduced portion 0 the spindle continues downwardlythrough the holder 48 and a collar 53, the latter being disposeddirectly beneath the holder. A pin 54 secures the collar 53 to thespindle. By this construction and arrangement, the upward movement ofthe rocking lever 39 lifts the spin- .dle, while the downward movementof said lever de resses the spindle. In Fig. 3, the rocking ever 39 isshown in the central osi- H tion by the full lines, while the dottedines w-b indicate the up and down movements of the lever forreciprocatin or oscillating the spindle 13, as well as t e sander 13.

The full and dotted lines at the top of Figs. 1 and 3 show the extentthe sander 13 may be oscillated while erformin or polishin work, By theroc ing ever 39. When the fever 39 is rocked up and down, as described,the end 40 of said lever slides on the flattened portion 41' of saidshaft 41. This provision is necessary in order to allow the opposite endof lever 39 to move with the spindle 13 to the extremes of its strokesindicated by the dotted lines a---?).

In practice the motor is preferably operated at about 1800 revolutionser minute, and being connected directly wii h dle and sander, the latterrotate at the same speed. At the same time, the reciprocations of thespindle, owing to the reduction effected by the worm-and-gear mechanism,

number from 50 to 100 revolution per minwormear. I

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is-

1. The combination with a source of power, of a spindle supportingacylindrical sander, a worm and gear driven by said spindle, said spindleslidable in said worm for oscillating said sander, a rocking lever forreciprocating said spindle, and means for operatively connecting saidlever with said gear.

2. In an oscillating spindle sander. a rotatable spindle, a sleeve inwhich said spindle is reciprocatable driven by said spindle, said sleevecomprising a Worm, a rocking lever for reciprocating said s indl e, agear driven by said worm, a cam-s aft supporting and operated by saidgear, and means for operatively connecting said cam-shaft with saidrocking lever.

3. In a sanding machine, a spindle supporting a cylindrical sander, asleeve for driving said spindle, a second sleeve surrounding and drivenby said spindle, said second sleeve comprising a worm, a wormgear drivenby said worm, a shaft supporting and driven by said gear, said shafthaving a cam, a link engaged and operated by said cam, and a leverrocked by said link, one end of said lever connected to said spindleadapted to reciprocate said spindle in said sleeves.

In testimony whereof I aflix my signature.

RAY L. CARTER.

its rindingthe spin- I

